Free to Choose: Investigating the Sample Complexity
for Active Learning of Real Valued Functions.
P. Niyogi.
Proc. of International Conference on Machine Learning
(ICML-95). Lake Tahoe, CA, July, 1995.
(The conference paper is missing from my archives. For a longer
version of this paper, see below)

An Active Learning Formulation with Applications to Object Detection.
K. K. Sung and P. Niyogi.
submitted to International Journal of Pattern Recognition and AI.
(Version of MIT AI Memo-1483).
(This paper never appeared due to the unfortunate and sudden demise
of Kah Kay Sung.)